Question

Explain the following are composite numbers are not i) 7 x 11 x 13 + 13 ii) ( 17 x 11 x 2) + ( 7 x 11 x 5)
with explanation​

Answer 1

Answer:

Given 7×11×13+13

=13×(7×11+1)=3×78

This number is multiple of two integers.Hence it has more than two factors.Hence it is a composite number.

similarly in

7×6×5×4×3 ×2×1+5

=5(7×6×4×3 ×2×1+1)=5×1009

This number is multiple of two integers.Hence it has more than two factors.Hence it is a composite number.